Because as stated above people have their accounts linked. Update Facebook with the hash tags and it will also update their twitter account. This is more commonly used for companies that have a wide social network and it saves time for the social media team.

But what does it do, or mean?
Do people type them in themselves for a reason?!

All it does it update both twitter and Facebook at the same time. Twitter works with hash tags. Instagram also uses it, so when you see someone upload a photo of their kid and they do a tonne of hash tags with words like cute, love, summer, fun, besties it tags the photo so strangers can search the words cute, summer, love etc and that photo will appear.

I'm not a fan of twitter or Instagram so I don't know the entire ins and outs of it. Someone else might be able to shed more light...

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